Some workers found there are two PCs time relay in the press brakes machine,they do not know how to use this small tool.Now,first of all, you must know the time relay is used to delay the time.one is used when the upper die move down,another is used to decide how long the die press on the parts.this time relay can be adjusted by yourself.for example,you can set 5 seconds or 10 seconds.of course, this device makes real impact when you bend the metal with a big quantity.it also can decide the time between first action and second action.if you bend small quantity,you do not need to know it at all